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How do the phases of Venus's help?

Answer:
Galileo was able to observe Venus going through a full set of phases, something prohibited by the Ptolemaic system (which would never allow Venus to be fully lit from the perspective of the Earth or more than semi-circular). This observation essentially ruled out the Ptolemaic system, and was compatible only with the Copernican system and the Tychonic system and other geoheliocentric models such as the Capellan and Riccioli's extended Capellan model.
First answer by Cosmospup. Last edit by Cosmospup. Contributor trust: 851 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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